Abstract
A reasonable estimate of the fate of released radionuclides is important in the aspect of safety assessment of spent fuel repository. In this study, experiments of Cs and Se adsorption to 54 different Kinmen area granite samples were conducted. The connection between nuclide uptake and chemical and mineral composition was evaluated by using linear regression. In the condition studied herein, the Cs、Se uptake, although poor R-square values appeared, is positively correlated to content of Al2O3、Fe2O3、CaO、MgO. Observed poor R-square values are likely the result of the complexity of granite samples. Further, when isolating results of those fracture zone samples out of others, the R-square values were greatly improved. This means that those secondary minerals such as kaolinite, smectite, illite, and zeolite will pronouncedly control the transport of nuclides. To quantify the adsorption behaviors, the concept of surface complexation modeling was applied and the limitation of this technique was evaluated by fitting the experiments of Cs adsorption to synthesized layered perovskite K1+5yCa2Nb3-xO10minerals. Results showed that the effect of Cs adsorption to edge sorption sites could be negligible for these cation-exchange-reaction dominant minerals.